CN117662185A - Reinforced structure of subway shield underpass railway track - Google Patents

Abstract

The application relates to a subway shield constructs under-passing railway track's reinforced structure relates to subway shield and constructs orbital technical field, including seting up a plurality of advance grouting holes at shield constructs quick-witted periphery, be provided with on the advance grouting hole and be used for pouring the grouting mechanism of advance grouting hole, grouting mechanism includes: the grouting pipe is arranged on the shield machine and extends into the advanced grouting hole, and the grouting pipe is used for grouting slurry into the advanced grouting hole; the telescopic bag is arranged on the outer side wall of the grouting pipe, can elastically deform and change the outer diameter of the telescopic bag, and the outer diameter of the telescopic bag is increased and is abutted against the inner side wall of the advanced grouting hole to form a plug; and the control assembly is used for controlling the outer diameter of the telescopic bag. The advanced grouting holes are divided into a plurality of parts to be sequentially poured, so that the advanced grouting holes of each section are filled up rapidly, the slurry amount of slurry penetrating into a soil layer is improved, and finally the reinforcement effect of the advanced reinforcement layer on the railway track penetrated under the subway shield is improved.

Description

Reinforced structure of subway shield underpass railway track

Technical Field

The application relates to the technical field of subway shield tracks, in particular to a reinforcing structure for a subway shield underpass railway track.

Background

In recent years, tunnels excavated by using a shield method are increasingly constructed, and when a shield machine passes through a limestone stratum or a region with higher requirements for preventing settlement, due to complexity and invisibility of geological conditions, solution cavities and soil cavities which are not disclosed by geological investigation holes can exist in the range and the periphery of the region. In the tunneling process of the shield machine, the slurry is possibly lost in a large quantity in an instant manner due to the sudden contact of the soil dissolving holes which are not found and not treated in the earlier stage, the attitude of the shield machine head and the shield machine is out of control, the shield construction safety is seriously influenced, and the safety of surrounding building structures is even endangered.

In order to reduce the probability of occurrence of the events, advanced grouting is needed to be carried out on the stratum, the advanced grouting refers to that before engineering excavation, the advanced drilling machine is used for drilling holes to the cutter head of the shield machine, then slurry is filled into soil layer cracks or solution holes through the holes drilled by the advanced drilling machine, various weak surfaces around the soil layer are filled with the slurry and are glued again, or the solution holes, the solution grooves, the soil holes and the like are filled into a whole, so that the physical and mechanical properties of the soil layer can be effectively improved, and the integrity and self-supporting capacity of the soil layer are improved.

The slurry is poured into the holes through a plurality of groups of advanced grouting pipes to form an advanced reinforcing layer, the common pouring mode at present is to insert the pouring pipes into the holes, then seal the hole openings, finally pour the slurry into the holes through the pouring pipes, and the slurry flows back to the hole openings when the slurry is poured, so that the slurry is filled in the holes and then is permeated into the soil layer through pressurization. When the holes are filled, the slurry at partial positions of the side walls of the holes is primarily solidified, so that the slurry amount of the slurry penetrating into the soil layer is greatly reduced, and finally, the reinforcing effect of the advanced reinforcing layer on the railway track penetrated under the subway shield is reduced.

Disclosure of Invention

In order to improve the reinforcement effect of the advanced reinforcement layer on the subway shield underpass railway track, the application provides a reinforcement structure of the subway shield underpass railway track.

The application provides a subway shield constructs under pass railway track's reinforced structure adopts following technical scheme:

the utility model provides a subway shield constructs under pass railway track's reinforced structure, is including seting up a plurality of advance grouting holes at shield constructs the machine periphery, be provided with on the advance grouting hole and be used for pouring the grouting mechanism of advance grouting hole, grouting mechanism includes:

the grouting pipe is arranged on the shield tunneling machine and extends into the advanced grouting hole, and the grouting pipe is used for grouting slurry into the advanced grouting hole;

the telescopic bag is arranged on the outer side wall of the grouting pipe, can elastically deform and change the outer diameter of the telescopic bag, and is increased in outer diameter and abutted against the inner side wall of the advanced grouting hole to form a plug;

and the control assembly is used for controlling the outer diameter of the telescopic bag.

By adopting the technical scheme, the grouting pipe and the telescopic bag extend into the advanced grouting hole, the outer diameter of the telescopic bag is increased through the control assembly, so that the volume of the telescopic bag is increased, the protective cover is abutted against the side wall of the hole to form a plug and form a sealing section, the grouting pipe fills slurry into the sealing section, the slurry fully permeates into the soil layer under the action of pressure, and various weak surfaces around the soil layer are filled and glued again to form a whole; then make the flexible bag external diameter reduce through control assembly, be convenient for flexible bag remove next assigned position in advance slip casting downthehole and carry out the shutoff, cut apart advance slip casting hole into many and pour for advance slip casting downthehole quick packing of each section has improved the thick liquid volume that thick liquid permeated to the soil layer, has finally improved the reinforcement effect of advance reinforcement layer to subway shield underpass railway track.

Further, the control assembly includes:

the medium box is arranged on the shield machine and is used for providing a medium for enabling the telescopic bag to stretch;

a transfer pump provided on the medium tank and configured to discharge the medium in the medium tank;

the feeding pipe is arranged on the conveying pump and is communicated with the inside of the telescopic bag, and the feeding pipe is used for conveying a medium discharged by the conveying pump into the telescopic bag;

the discharging pipe is arranged on the telescopic bag and used for discharging the medium in the telescopic bag;

the control valve is arranged on the medium box and connected with the feeding pipe and the discharging pipe, and the control valve is used for respectively controlling the opening or closing of the feeding pipe and the discharging pipe.

By adopting the technical scheme, when the outer diameter of the telescopic bag needs to be increased, the conveying pump is started to discharge the medium in the medium box into the telescopic bag through the feeding pipe, and when the pressure value in the telescopic bag reaches a set value, the feeding pipe is closed through the control valve, so that the telescopic bag is stable in a fixed size; when the outer diameter of the telescopic bag needs to be reduced, the discharge pipe is opened through the control valve to discharge the medium in the telescopic bag, the size of the outer diameter of the telescopic bag is controlled to be reduced through controlling the discharge amount, the advanced grouting holes are conveniently plugged, and the slurry amount of slurry penetrating into the soil layer is improved.

Further, a fixing frame for fixing the telescopic bag is arranged on the grouting pipe, and a positioning groove for fixing the telescopic bag is formed in the fixing frame.

Through adopting above-mentioned technical scheme, through placing the flexible bag in the constant head tank of fixed frame for mainly towards the external diameter direction increase when flexible bag volume increases, reduced the content of medium in the flexible bag, improved the flexible speed of flexible bag simultaneously.

Further, be provided with the safety cover that can take place elastic deformation on the fixed frame, flexible bag is located between fixed frame and the safety cover, make safety cover and advance slip casting hole inside wall direct contact when flexible bag volume increases.

Through adopting above-mentioned technical scheme, through the protection of safety cover for carry out direct contact through safety cover and advance slip casting hole lateral wall when flexible bag volume increases, reduced the wearing and tearing speed of flexible bag.

Further, the control assembly includes:

the fixing plate is arranged on the outer side wall of the grouting pipe;

the movable plate is arranged on the outer side wall of the grouting pipe in a sliding manner, the movable plate is positioned at one end of the fixed plate, which is far away from the bottom of the advanced grouting hole, and a placing cavity for placing the telescopic bag is formed between the fixed plate and the movable plate;

the driving piece is arranged on the fixed plate and used for driving the movable plate to be close to or far away from the fixed plate.

By adopting the technical scheme, when the outer diameter of the telescopic bag needs to be increased, the driving piece is started to slide the movable plate to a direction close to the fixed plate for a specified distance, so that the volume of the placing cavity is reduced, and the telescopic bag is extruded to increase the outer diameter of the telescopic bag; when the outer diameter of the telescopic bag needs to be reduced, the driving piece is started to enable the movable plate to slide for a specified distance in the direction away from the fixed plate, so that the volume of the placing cavity is increased, the extrusion of the telescopic bag is reduced, the outer diameter of the telescopic bag is reduced, the advanced grouting holes are conveniently plugged, and the slurry amount of slurry penetrating into a soil layer is improved.

Further, the driving piece is an electric telescopic rod, and a cylinder body and a piston rod of the electric telescopic rod are respectively arranged on the fixed plate and the movable plate.

By adopting the technical scheme, the electric telescopic rod is started and controls the distance between the movable plate and the fixed plate, so that the outer diameter of the telescopic bag is controlled, and the telescopic bag can slide in the advanced grouting hole or plug the advanced grouting hole conveniently.

Furthermore, pressure gauges are arranged on the grouting pipe and the feeding pipe, and the pressure gauges are used for detecting the pressure value of the slurry in the advanced grouting hole and the pressure value of the medium in the telescopic bag.

By adopting the technical scheme, the pressure gauge on the grouting pipe is convenient for monitoring the pressure value of the slurry in the grouting hole in real time, and is convenient for ensuring that the slurry fully permeates into the soil layer; the pressure gauge on the feeding pipe is convenient for monitoring the pressure value inside the telescopic bag and controlling the medium quantity filled in the telescopic bag.

Furthermore, when the advanced grouting hole is drilled, the soil layer is sampled and detected through the hollow drill rod, and before grouting, the position and the size of a karst cave, a fluid bowl, a soil cave and the like in the advanced grouting hole are detected.

By adopting the technical scheme, the slurry amount is preliminarily judged through the soil layer sample monitoring and the hole position monitoring results before grouting of the grouting pipe, and the advanced grouting holes are segmented according to the required slurry amount, so that the condition that the slurry cannot be solidified initially before filling the advanced grouting holes with the slurry is ensured, the slurry amount penetrating into the soil layer is improved, and finally the reinforcement effect of the advanced reinforcement layer on the railway track penetrated under the subway shield is improved. .

In summary, the present application includes the following beneficial technical effects:

1. the method comprises the steps of detecting an advanced grouting hole, primarily judging the required slurry amount according to a detection result to segment the advanced grouting hole, extending a grouting pipe and a telescopic bag into the advanced grouting hole, filling a medium into the telescopic bag through a feeding pipe, increasing the volume of the telescopic bag, propping a protective cover against the side wall of the hole to form a plug and form a sealing section, pouring slurry into the sealing section by the grouting pipe, fully penetrating the slurry into a soil layer under the action of pressure, and filling and re-cementing various weak surfaces around the soil layer to form a whole; then the medium is discharged through the discharge pipe, so that the volume of the telescopic bag is reduced, the telescopic bag can conveniently move to the next appointed position in the advanced grouting hole for blocking, the advanced grouting hole is divided into a plurality of parts for pouring, the advanced grouting hole of each section is filled up rapidly, the slurry amount of slurry penetrating into the soil layer is improved, and finally the reinforcement effect of the advanced reinforcement layer on the subway shield underpass railway track is improved.

2. The pressure value in the flexible bag reaches a set value by filling media into the flexible bag, then the flexible bag is placed between the fixed plate and the movable plate and wrapped by the protective sleeve, the grouting pipe and the flexible bag extend into the appointed position in the advanced grouting hole, the electric telescopic rod shortens to enable the movable plate to be close to the fixed plate and enable the flexible bag to tightly prop against the protective sleeve on the inner side wall of the advanced grouting hole to form a sealing block, then grouting is carried out in the advanced grouting hole, after grouting is finished, the electric telescopic rod extends to enable the outer diameter of the flexible bag to be reduced, the flexible bag is convenient to move to the next appointed position in the advanced grouting hole to be sealed, and the advanced grouting hole is divided into a plurality of parts to be poured, so that the flexible bag is controlled.

Drawings

FIG. 1 is a schematic view of a first embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of A-A of FIG. 1;

FIG. 3 is a schematic structural diagram of a first embodiment of the present application, mainly showing a control component;

FIG. 4 is an enlarged schematic view of portion B of FIG. 2;

FIG. 5 is a schematic structural diagram of a second embodiment of the present application, mainly showing a control component;

FIG. 6 is a schematic cross-sectional view of C-C of FIG. 5;

fig. 7 is an exploded view of a second embodiment of the present application, mainly showing the control components.

Reference numerals: 1. a shield machine; 11. advanced grouting holes; 2. a grouting mechanism; 21. grouting pipe; 22. a bellows; 23. a control assembly; 231. a media box; 232. a transfer pump; 233. a feeding pipe; 234. a discharge pipe; 235. a control valve; 236. a three-way pipe; 3. an advanced reinforcement layer; 4. a fixed frame; 41. an annular groove; 42. a protective cover; 43. a fixed cavity; 5. a pressure gauge; 6. a fixing plate; 61. a movable plate; 62. a driving member; 621. an electric telescopic rod; 63. a placement cavity; 64. and a protective sleeve.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-7.

The embodiment of the application discloses a reinforcement structure for a subway shield underpass railway track.

Example 1

Referring to fig. 1, a reinforcement structure for a subway shield underpass railway track comprises a plurality of advanced grouting holes 11 formed in the periphery of a shield machine 1, wherein a grouting mechanism 2 for pouring the advanced grouting holes 11 is arranged on the advanced grouting holes 11.

Referring to fig. 1 and 2, there may be a karst cave, a solution tank, a soil cave, etc. which are not revealed by the geological conditions in the construction area and the periphery, and the advanced grouting is required to be performed on the unexcavated soil layer before the shield tunneling machine 1 is tunneling due to the complexity and invisible running of geological conditions; before engineering excavation, drilling is carried out through an advanced drilling machine until the cutter head of the shield machine 1, so that a drill bit and the axis of a tunnel form a certain angle to drill an advanced grouting hole 11, and the angle of the embodiment is 6 degrees; when the drilling is carried out, the hollow drill rod is adopted to drill and excavate the soil layer in front of the cutter head of the shield machine 1, so that a part of the soil layer at the drilling position remains in the hollow drill rod after the drilling is finished, and then the soil layer in the hollow drill rod is detected and analyzed, so that the slurry amount of the follow-up needed slurry can be estimated conveniently; after the drilling is finished, the inside of the advanced grouting hole 11 is detected and confirmed through a detector, so that the positions and the sizes of karst cave, solution tank, soil hole and the like in the advanced grouting hole 11 are conveniently confirmed, and the needed slurry is preliminarily estimated according to the detection result; in order to improve the reinforcement strength of the soil at the front end of the shield tunneling machine 1, a plurality of advanced grouting holes 11 are formed in the advanced drilling along the peripheral direction of the shield tunneling machine 1, and because the probability of collapse of the upper half of the tunnel is larger, the number of the advanced grouting holes 11 in the upper half of the tunnel is greater than that of the lower half of the shield tunneling machine 1, the number of the advanced grouting holes 11 in the embodiment is 6, 4 advanced grouting holes 11 are formed in the upper half of the tunnel, 2 advanced grouting holes 11 are formed in the lower half of the tunnel, the soil layer at the front end of the shield tunneling machine 1 forms a layer of advanced reinforcement layer 3 by pouring slurry into a plurality of groups of advanced grouting holes 11, the shield tunneling machine 1 starts to tunnel forwards after the advanced reinforcement layer 3 is completely solidified, and the probability of collapse of the soil layer of the shield tunneling machine 1 during tunneling is reduced by reinforcement of the advanced reinforcement layer 3.

Referring to fig. 3 and 4, after analyzing and confirming the conditions in the advance grouting holes 11, segmenting each advance grouting hole 11, grouting by a grouting mechanism 2, wherein the grouting mechanism 2 comprises a grouting pipe 21, a telescopic bag 22 and a control assembly 23, the grouting pipe 21 is of a tubular structure with a hollow inside, the grouting pipe 21 is fixedly arranged on the shield machine 1 and extends into the advance grouting holes 11, the grouting pipe 21 is communicated with the inside of the shield machine 1, and the grouting pipe 21 is used for grouting slurry in the shield machine 1 into the advance grouting holes 11; the grouting pipe 21 is provided with the pressure gauge 5, and the pressure gauge 5 is used for detecting the liquid pressure value of the slurry in the grouting pipe 21, so that the pressure value of the slurry can be monitored in real time when the advanced grouting hole 11 is filled; the outer pipe wall of the grouting pipe 21 close to the front end is fixedly provided with a fixing frame 4, the fixing frame 4 is of an annular structure and is coaxially and fixedly arranged on the outer side wall of the grouting pipe 21, the inner circle of the fixing frame 4 is in sealing connection with the outer side wall of the grouting pipe 21, and an annular groove 41 is coaxially formed in one end, away from the grouting pipe 21, of the fixing frame 4 and is coaxial with the fixing frame 4.

Referring to fig. 3 and 4, the flexible bag 22 is in a circular ring structure and is clamped and installed in the annular groove 41, the flexible bag 22 can elastically deform and change the outer diameter of the flexible bag 22, the flexible bag 22 is an elastic fiber layer made of polyurethane material, the high-pressure explosion-proof performance and corrosion resistance performance of the flexible bag 22 are good, and a medium is filled in the flexible bag 22; the protective cover 42 which can be elastically deformed is fixedly arranged at one end, far away from the pouring pipe, of the fixed frame 4, the protective cover 42 is formed by weaving polyester yarns which can be elastically deformed, and the protective cover 42 has good wear resistance and ageing resistance; a fixed cavity 43 for placing the telescopic bag 22 is formed between the annular groove 41 on the fixed frame 4 and the protective cover 42, the telescopic bag 22 is fixedly arranged in the fixed cavity 43, and the protective cover 42 stretches along with the stretching of the telescopic bag 22; when the outer diameter of the telescopic bag 22 is increased, the telescopic bag 22 abuts against the protective cover 42 on the inner side wall of the advanced grouting hole 11 to form a blocking, so that a section of hole from the bottom of the advanced grouting hole 11 to the position of the telescopic bag 22 forms a relatively sealed sealing section; the grouting pipe 21 is used for pouring slurry into the plugging section, and the slurry required by a single sealing section is less, so that the slurry can rapidly fill the sealing section, then the redundant slurry permeates into the soil layer under the action of pressure, and various weak surfaces around the soil layer are filled and glued again to form a whole, thereby improving the slurry amount of the slurry permeated into the soil layer.

Referring to fig. 3 and 4, the control assembly 23 is used for controlling the outer diameter of the telescopic bag 22, the control assembly 23 comprises a medium box 231, a delivery pump 232, a feeding pipe 233 and a discharging pipe 234, the medium box 231 is fixedly installed on the shield machine 1, and the medium box 231 is used for providing a medium for expanding and contracting the telescopic bag 22; the delivery pump 232 is fixedly arranged on the medium tank 231 and is communicated with the inside of the medium tank 231, the delivery pump 232 is used for discharging the medium in the medium tank 231, the feeding pipe 233 is fixedly arranged on the delivery pump 232 and is communicated with the inside of the telescopic bag 22, the feeding pipe 233 is used for conveying the medium discharged by the delivery pump 232 into the telescopic bag 22, the telescopic bag 22 is increased in volume and increased in outer diameter, and finally the protective cover 42 is abutted against the inner side wall of the advanced grouting hole 11 to form a seal; the feeding pipe 233 is fixedly provided with a pressure gauge 5 and is used for detecting the pressure value in the telescopic bag 22, the discharging pipe 234 is connected to the feeding pipe 233 through a three-way pipe 236 and is communicated with the inside of the telescopic bag 22, and the discharging pipe 234 is used for discharging the medium in the telescopic bag 22, so that the volume of the telescopic bag 22 is reduced, and the grouting pipe 21 is convenient for driving the telescopic bag 22 to move in the advanced grouting hole 11; the medium of this embodiment is hydraulic oil.

Referring to fig. 3 and 4, the control assembly 23 further includes a control valve 235, wherein the control valve 235 is two groups of control switches fixedly installed on the feeding pipe 233 and the discharging pipe 234, and the control valve 235 can respectively control the opening or closing of the feeding pipe 233 and the discharging pipe 234; when the grouting device is used, the telescopic bag 22 is stretched into a designated position in the advanced grouting pipe 21 through the grouting pipe 21, the conveying pump 232 is started, the feeding pipe 233 is started through the control valve 235, the discharging pipe 234 is closed, a medium in the medium box 231 is discharged into the telescopic bag 22, the telescopic bag 22 is increased in volume, the protective cover 42 is abutted against the inner side wall of the advanced grouting hole 11 to form a seal, when the pressure value in the telescopic bag 22 reaches a set value, the conveying pump 232 and the feeding pipe 233 are closed, a section of hole from the bottom of the advanced grouting hole 11 to the position of the telescopic bag 22 forms a relatively sealed sealing section, and then a karst cave, a solution groove, a soil cave and the like in the sealing section are fully sealed according to a detection result; the scale of karst cave is estimated initially according to grouting amount and karst cave hole diameter detected by the sealing section during plugging, then grouting pipe 21 is filled with slurry, and the pressure value of the slurry in the sealing section is detected through pressure gauge 5, so that the slurry in the plugging section is not full and needs to be continuously grouting, the slurry in the plugging section permeates into a soil layer, various weak surfaces around the soil layer are filled and glued again to form a whole, and the slurry amount of the slurry permeated into the soil layer is improved.

Referring to fig. 3 and 4, after the slurry pressure value in the section to be sealed is stably maintained at a specified value for a period of time, the control valve 235 opens the discharge pipe 234 so that a part of the medium in the bellows 22 is discharged, then the control valve 235 closes the discharge pipe 234 so that the volume of the bellows 22 is reduced, thereby facilitating the slip casting pipe 21 to drive the bellows 22 to slide in the advanced slip casting pipe 21 under the condition of ensuring sealing, and after reaching the next specified position, the control valve 235 closes the discharge pipe 234 and opens the feeding; then repeating the above actions, dividing the advanced grouting holes 11 into a plurality of parts for pouring in sequence, so that the advanced grouting holes 11 of each section are filled up quickly, and the slurry is permeated into the soil layer through pressurization, so that the slurry amount of the slurry permeated into the soil layer is improved, and finally, the reinforcement effect of the advanced reinforcement layer 3 on the subway shield underpass railway track is improved; in this embodiment, the advanced grouting holes 11 are segmented according to the amount of slurry needed by analysis based on the detection result, so as to ensure that the slurry in the advanced grouting holes 11 will not be solidified initially before the advanced grouting holes 11 are filled with slurry.

The working principle of the embodiment of the application is as follows:

the method comprises the steps of firstly judging the required slurry amount through a detection result to segment an advanced grouting hole 11, then extending a grouting pipe 21 and a telescopic bag 22 into the advanced grouting hole 11, filling media into the telescopic bag 22 through a feeding pipe 233, enabling the telescopic bag 22 to be increased in volume, enabling a protective cover 42 to be abutted against the side wall of the hole to form a plug and form a sealing section, pouring slurry into the sealing section through the grouting pipe 21, enabling the slurry to fully penetrate into a soil layer under the action of pressure, and filling and re-cementing various weak surfaces around the soil layer to form a whole; then, the medium is discharged through the discharging pipe 234, so that the volume of the telescopic bag 22 is reduced, the telescopic bag 22 can conveniently move to the next appointed position in the advanced grouting hole 11 to be blocked, the advanced grouting hole 11 is divided into a plurality of parts to be poured, the advanced grouting hole 11 of each section is filled up rapidly, the slurry amount of slurry penetrating into a soil layer is improved, and finally the reinforcing effect of the advanced reinforcing layer 3 on a railway track penetrating under the subway shield is improved.

Example 2

Referring to fig. 5 and 6, the present embodiment is different from embodiment 1 in that the control assembly 23 includes a fixed plate 6 and a movable plate 61, the fixed plate 6 is fixedly installed on the outer sidewall of the grouting pipe 21, and polytetrafluoroethylene is smeared on the side of the fixed plate 6 near the bottom of the grouting pipe 21 to improve the surface finish of the fixed plate 6; the movable plate 61 is slidably arranged on the outer side wall of the grouting pipe 21, the movable plate 61 is positioned at one end of the fixed plate 6 far away from the bottom of the advanced grouting hole 11, and a placing cavity 63 for placing the telescopic bag 22 is formed between the movable plate 61 and the fixed plate 6; a protective sleeve 64 is arranged between the fixed plate 6 and the movable plate 61, the protective sleeve 64 can elastically deform, the protective sleeve 42 is formed by weaving elastic-deformable polyester yarns, the protective sleeve 42 has good wear resistance and ageing resistance, and the protective sleeve 64 is sleeved on the telescopic bag 22; when the movable plate 61 slides to approach the fixed plate 6, the volume of the placing cavity 63 is reduced, the telescopic bag 22 is extruded to deform and the protective cover 42 is abutted against the inner side wall of the advanced grouting hole 11 to form a plug, so that a section of hole from the bottom of the advanced grouting hole 11 to the position of the telescopic bag 22 forms a relatively sealed sealing section; when the movable plate 61 slides towards the end far away from the fixed plate 6, the volume of the placing cavity 63 is increased, and the telescopic bag 22 and the protective sleeve 64 rebound to reduce the outer diameter, so that the grouting pipe 21 drives the telescopic bag 22 to move in the advanced grouting hole 11.

Referring to fig. 6 and 7, the control unit 23 further includes a driving member 62, the driving member 62 is fixedly mounted on the fixed plate 6 and is used for driving the movable plate 61 to approach or separate from the fixed plate 6, the driving member 62 of the present embodiment is an electric telescopic rod 621, a cylinder body of the electric telescopic rod 621 is fixedly mounted on the fixed plate 6, a piston rod of the electric telescopic rod 621 is fixedly mounted on the movable plate 61, the movable plate 61 is separated from the fixed plate 6 when the electric telescopic rod 621 extends, the movable plate 61 is made to approach the fixed plate 6 when the electric telescopic rod 621 shortens, and the abutting degree of the telescopic bag 22 and the inner side wall of the advanced grouting hole 11 is controlled by controlling the telescopic length of the electric telescopic rod 621.

Referring to fig. 5 and 6, in use, firstly, medium is filled into the telescopic bag 22 to enable the pressure value in the telescopic bag 22 to reach a set value, then the telescopic bag 22 is placed between the fixed plate 6 and the movable plate 61 and is wrapped by the protective sleeve 64, after the telescopic bag 22 is stretched into a designated position in the advanced grouting pipe 21 by the grouting pipe 21, the electric telescopic rod 621 is shortened to enable the movable plate 61 to approach the fixed plate 6, the telescopic bag 22 is extruded to deform and the protective cover 42 is abutted against the inner side wall of the advanced grouting hole 11 to form a sealing section which is relatively sealed, and after the electric telescopic rod 621 is shortened to the designated position, a section of hole from the bottom of the advanced grouting hole 11 to the position of the telescopic bag 22 is formed; grouting slurry into the advanced grouting holes 11 to fill the sealing section with the slurry, then penetrating the slurry into the soil layer under the action of pressure, and filling and re-cementing various weak surfaces around the soil layer to form a whole, so that the slurry amount penetrating the soil layer is improved; after the slurry pressure value in the sealing section is stably maintained at a specified value for a period of time, the electric telescopic rod 621 stretches to a specified position, so that the outer diameter of the telescopic bag 22 is reduced, the grouting pipe 21 is convenient to drive the telescopic bag 22 to slide in the advanced grouting pipe 21 under the condition of ensuring sealing, the next specified position is reached, then the actions are repeated, the advanced grouting holes 11 are divided into a plurality of parts for pouring, the advanced grouting holes 11 of each section are rapidly filled, the slurry is permeated into the soil layer through pressurization, the slurry amount permeated into the soil layer is improved, and finally the reinforcing effect of the advanced reinforcing layer 3 on the railway track penetrated under the subway shield is improved.

The working principle of the embodiment of the application is as follows:

firstly, filling a medium into the telescopic bag 22 to enable the pressure value in the telescopic bag 22 to reach a set value, then placing the telescopic bag 22 between the fixed plate 6 and the movable plate 61 and wrapping the telescopic bag 22 by the protective sleeve 64, extending the grouting pipe 21 and the telescopic bag 22 into the appointed position in the advanced grouting hole 11, shortening the electric telescopic rod 621 to enable the movable plate 61 to be close to the fixed plate 6 and enable the telescopic bag 22 to tightly prop the protective sleeve 64 on the inner side wall of the advanced grouting hole 11 to form a blocking, grouting the advanced grouting hole 11, and after grouting is finished, extending the electric telescopic rod 621 to enable the outer diameter of the telescopic bag 22 to be reduced so as to facilitate the telescopic bag 22 to move to the next appointed position in the advanced grouting hole 11 to be blocked, and dividing the advanced grouting hole 11 into a plurality of parts to perform pouring, thereby realizing control of the telescopic bag 22.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (8)

1. A reinforced structure of subway shield underpass railway track, its characterized in that: including seting up a plurality of advance grouting holes (11) at shield constructs quick-witted (1) periphery, be provided with on advance grouting hole (11) and be used for pouring grouting mechanism (2) to advance grouting hole (11), grouting mechanism (2) include:

the grouting device comprises a grouting pipe (21), wherein the grouting pipe (21) is arranged on a shield machine (1) and extends into an advanced grouting hole (11), and the grouting pipe (21) is used for grouting slurry into the advanced grouting hole (11);

the telescopic bag (22) is arranged on the outer side wall of the grouting pipe (21), the telescopic bag (22) can elastically deform and change the outer diameter of the telescopic bag (22), and the outer diameter of the telescopic bag (22) is increased and is abutted against the inner side wall of the advanced grouting hole (11) to form a plug;

and the control assembly (23) is used for controlling the outer diameter of the telescopic bag (22).

2. The reinforcement structure for a subway shield underpass railway track according to claim 1, wherein: the control assembly (23) comprises:

a medium tank (231), wherein the medium tank (231) is arranged on the shield machine (1) and is used for providing a medium for expanding and contracting the telescopic bag (22);

a delivery pump (232), the delivery pump (232) being provided on the medium tank (231) and being used for discharging the medium in the medium tank (231);

the feeding pipe (233) is arranged on the conveying pump (232) and is communicated with the inside of the telescopic bag (22), and the feeding pipe (233) is used for conveying a medium discharged by the conveying pump (232) into the telescopic bag (22);

a discharge pipe (234), wherein the discharge pipe (234) is arranged on the telescopic bag (22) and is used for discharging the medium in the telescopic bag (22);

and the control valve (235) is arranged on the medium box (231) and connected with the feeding pipe (233) and the discharging pipe (234), and the control valve (235) is used for controlling the opening or closing of the feeding pipe (233) and the discharging pipe (234) respectively.

3. The reinforcement structure for a subway shield underpass railway track according to claim 1, wherein: the grouting pipe (21) is provided with a fixing frame (4) for fixing the telescopic bag (22), and the fixing frame (4) is provided with a positioning groove for fixing the telescopic bag (22).

4. A reinforcing structure for a subway shield underpass railway track according to claim 3, wherein: the device is characterized in that a protective cover (42) capable of elastically deforming is arranged on the fixed frame (4), the telescopic bag (22) is located between the fixed frame (4) and the protective cover (42), and the protective cover (42) is in direct contact with the inner side wall of the advanced grouting hole (11) when the volume of the telescopic bag (22) is increased.

5. The reinforcement structure for a subway shield underpass railway track according to claim 1, wherein: the control assembly (23) comprises:

the fixing plate (6) is arranged on the outer side wall of the grouting pipe (21);

the movable plate (61) is arranged on the outer side wall of the grouting pipe (21) in a sliding manner, the movable plate (61) is positioned at one end of the fixed plate (6) far away from the bottom of the advanced grouting hole (11), and a placing cavity (63) for placing the telescopic bag (22) is formed between the fixed plate (6) and the movable plate (61);

and the driving piece (62) is arranged on the fixed plate (6) and is used for driving the movable plate (61) to be close to or far away from the fixed plate (6).

6. The reinforcement structure for a subway shield underpass railway track as set forth in claim 5, wherein: the driving piece (62) is an electric telescopic rod (621), and a cylinder body and a piston rod of the electric telescopic rod (621) are respectively arranged on the fixed plate (6) and the movable plate (61).

7. The reinforcement structure for a subway shield underpass railway track according to claim 2, wherein: the grouting device is characterized in that the grouting pipe (21) and the feeding pipe (233) are respectively provided with a pressure gauge (5), and the pressure gauges (5) are used for detecting the pressure value of slurry in the advanced grouting hole (11) and the pressure value of media in the telescopic bag (22).

8. The reinforcement structure for a subway shield underpass railway track according to claim 1, wherein: the soil layer is sampled and detected through the hollow drill rod when the advanced grouting hole (11) is drilled, and the position and the size of a karst cave, a fluid bowl, a soil cave and the like in the advanced grouting hole (11) are detected before grouting is carried out on the advanced grouting hole (11).